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	 Test case: make sure that we use only used columns when we generate a groupby node
	 for an exists subquery that needs to group on all columns of the main query 

	create table foo (a int, b numeric, c char);
	create table bar (c int, d numeric, e char, f numeric) partition by range(c) (start (0) end (6) every (3));
	insert into foo values (1, 1.23, 'a'), (2, 2.24, 'b');
	insert into bar values (1, 1.45, 'e', 2.24), (1, 4.2, 'b', 5.5);
	select sum(case when exists (select 1 from foo where foo.c = bar.e) then bar.d else 0 end) as x from bar;

	We want to ensure that only the used columns of the query is captured in the group by/sort and nothing more, the actual plan details are less important.
	Here, bar.f should not appear anywhere in the query plan. 

	                                                                          QUERY PLAN
	---------------------------------------------------------------------------------------------------------------------------------------------------------------
	 Aggregate  (cost=0.00..862.00 rows=1 width=8)
	   ->  Gather Motion 3:1  (slice5; segments: 3)  (cost=0.00..862.00 rows=1 width=8)
	         ->  Aggregate  (cost=0.00..862.00 rows=1 width=8)
	               ->  GroupAggregate  (cost=0.00..862.00 rows=1 width=9)
	                     Group By: bar.c, bar.d, bar.e, bar.ctid, bar.tableoid, bar.gp_segment_id, "outer".ColRef_0024
	                     ->  Sort  (cost=0.00..862.00 rows=1 width=35)
	                           Sort Key: bar.c, bar.d, bar.e, bar.ctid, bar.tableoid, bar.gp_segment_id, "outer".ColRef_0024
	                           ->  Redistribute Motion 3:3  (slice4; segments: 3)  (cost=0.00..862.00 rows=1 width=35)
	                                 Hash Key: bar.c, bar.d, bar.e, bar.ctid, bar.tableoid, bar.gp_segment_id, "outer".ColRef_0024
	                                 ->  GroupAggregate  (cost=0.00..862.00 rows=1 width=35)
	                                       Group By: bar.c, bar.d, bar.e, bar.ctid, bar.tableoid, bar.gp_segment_id, "outer".ColRef_0024
	                                       ->  Sort  (cost=0.00..862.00 rows=1 width=35)
	                                             Sort Key: bar.c, bar.d, bar.e, bar.ctid, bar.tableoid, bar.gp_segment_id, "outer".ColRef_0024
	                                             ->  Redistribute Motion 3:3  (slice3; segments: 3)  (cost=0.00..862.00 rows=1 width=35)
	                                                   ->  Hash Left Join  (cost=0.00..862.00 rows=1 width=35)
	                                                         Hash Cond: bar.e = foo.c
	                                                         ->  Redistribute Motion 3:3  (slice1; segments: 3)  (cost=0.00..431.00 rows=1 width=34)
	                                                               Hash Key: bar.e
	                                                               ->  Sequence  (cost=0.00..431.00 rows=1 width=34)
	                                                                     ->  Partition Selector for bar (dynamic scan id: 1)  (cost=10.00..100.00 rows=34 width=4)
	                                                                           Partitions selected: 2 (out of 2)
	                                                                     ->  Dynamic Table Scan on bar (dynamic scan id: 1)  (cost=0.00..431.00 rows=1 width=34)
	                                                         ->  Hash  (cost=431.00..431.00 rows=1 width=3)
	                                                               ->  Result  (cost=0.00..431.00 rows=1 width=3)
	                                                                     ->  Redistribute Motion 3:3  (slice2; segments: 3)  (cost=0.00..431.00 rows=1 width=2)
	                                                                           Hash Key: foo.c
	                                                                           ->  Table Scan on foo  (cost=0.00..431.00 rows=1 width=2)
  ]]>
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        <dxl:OpFunc Mdid="0.2791.1.0"/>
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      </dxl:GPDBScalarOp>
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      <dxl:CTEList/>
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                    <dxl:LogicalSelect>
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                      <dxl:LogicalGet>
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                            <dxl:Column ColId="13" Attno="2" ColName="b" TypeMdid="0.1700.1.0" ColWidth="9"/>
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                            <dxl:Column ColId="21" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
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              <dxl:ValuesList ParamType="aggdirectargs"/>
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              <dxl:ValuesList ParamType="aggdistinct"/>
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        <dxl:LogicalGet>
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        </dxl:LogicalGet>
      </dxl:LogicalGroupBy>
    </dxl:Query>
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          <dxl:Cost StartupCost="0" TotalCost="862.000759" Rows="1.000000" Width="8"/>
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        <dxl:GroupingColumns/>
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        <dxl:GatherMotion InputSegments="0,1,2" OutputSegments="-1">
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          <dxl:Filter/>
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            <dxl:Properties>
              <dxl:Cost StartupCost="0" TotalCost="862.000728" Rows="1.000000" Width="8"/>
            </dxl:Properties>
            <dxl:GroupingColumns/>
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                        <dxl:Not>
                          <dxl:IsNull>
                            <dxl:Ident ColId="23" ColName="ColRef_0023" TypeMdid="0.16.1.0"/>
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                        </dxl:Not>
                        <dxl:ConstValue TypeMdid="0.16.1.0" Value="true"/>
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                      <dxl:ConstValue TypeMdid="0.1700.1.0" Value="AAAACAAAAAA=" DoubleValue="0.000000"/>
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                  <dxl:ValuesList ParamType="aggdirectargs"/>
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                  <dxl:ValuesList ParamType="aggdistinct"/>
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            <dxl:Filter/>
            <dxl:Aggregate AggregationStrategy="Sorted" StreamSafe="false">
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                <dxl:Cost StartupCost="0" TotalCost="862.000728" Rows="1.000000" Width="9"/>
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              <dxl:GroupingColumns>
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                <dxl:GroupingColumn ColId="1"/>
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                <dxl:GroupingColumn ColId="4"/>
                <dxl:GroupingColumn ColId="9"/>
                <dxl:GroupingColumn ColId="10"/>
                <dxl:GroupingColumn ColId="23"/>
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                  <dxl:Ident ColId="23" ColName="ColRef_0023" TypeMdid="0.16.1.0"/>
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                <dxl:ProjElem ColId="0" Alias="c">
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                <dxl:ProjElem ColId="10" Alias="gp_segment_id">
                  <dxl:Ident ColId="10" ColName="gp_segment_id" TypeMdid="0.23.1.0"/>
                </dxl:ProjElem>
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                <dxl:Filter/>
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                        <dxl:ProjList/>
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                  <dxl:Result>
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                    <dxl:OneTimeFilter/>
                    <dxl:RedistributeMotion InputSegments="0,1,2" OutputSegments="0,1,2">
                      <dxl:Properties>
                        <dxl:Cost StartupCost="0" TotalCost="431.000024" Rows="2.000000" Width="2"/>
                      </dxl:Properties>
                      <dxl:ProjList>
                        <dxl:ProjElem ColId="13" Alias="c">
                          <dxl:Ident ColId="13" ColName="c" TypeMdid="0.1042.1.0" TypeModifier="5"/>
                        </dxl:ProjElem>
                      </dxl:ProjList>
                      <dxl:Filter/>
                      <dxl:SortingColumnList/>
                      <dxl:HashExprList>
                        <dxl:HashExpr>
                          <dxl:Ident ColId="13" ColName="c" TypeMdid="0.1042.1.0" TypeModifier="5"/>
                        </dxl:HashExpr>
                      </dxl:HashExprList>
                      <dxl:TableScan>
                        <dxl:Properties>
                          <dxl:Cost StartupCost="0" TotalCost="431.000017" Rows="2.000000" Width="2"/>
                        </dxl:Properties>
                        <dxl:ProjList>
                          <dxl:ProjElem ColId="13" Alias="c">
                            <dxl:Ident ColId="13" ColName="c" TypeMdid="0.1042.1.0" TypeModifier="5"/>
                          </dxl:ProjElem>
                        </dxl:ProjList>
                        <dxl:Filter/>
                        <dxl:TableDescriptor Mdid="6.423237.1.0" TableName="foo">
                          <dxl:Columns>
                            <dxl:Column ColId="11" Attno="1" ColName="a" TypeMdid="0.23.1.0" ColWidth="4"/>
                            <dxl:Column ColId="13" Attno="3" ColName="c" TypeMdid="0.1042.1.0" TypeModifier="5" ColWidth="2"/>
                            <dxl:Column ColId="14" Attno="-1" ColName="ctid" TypeMdid="0.27.1.0" ColWidth="6"/>
                            <dxl:Column ColId="15" Attno="-3" ColName="xmin" TypeMdid="0.28.1.0" ColWidth="4"/>
                            <dxl:Column ColId="16" Attno="-4" ColName="cmin" TypeMdid="0.29.1.0" ColWidth="4"/>
                            <dxl:Column ColId="17" Attno="-5" ColName="xmax" TypeMdid="0.28.1.0" ColWidth="4"/>
                            <dxl:Column ColId="18" Attno="-6" ColName="cmax" TypeMdid="0.29.1.0" ColWidth="4"/>
                            <dxl:Column ColId="19" Attno="-7" ColName="tableoid" TypeMdid="0.26.1.0" ColWidth="4"/>
                            <dxl:Column ColId="20" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
                          </dxl:Columns>
                        </dxl:TableDescriptor>
                      </dxl:TableScan>
                    </dxl:RedistributeMotion>
                  </dxl:Result>
                </dxl:HashJoin>
              </dxl:Sort>
            </dxl:Aggregate>
          </dxl:Aggregate>
        </dxl:GatherMotion>
      </dxl:Aggregate>
    </dxl:Plan>
  </dxl:Thread>
</dxl:DXLMessage>
